Split env, galaxy, and config into different container layers

[innovate-invent]

Currently the entire deployment is baked into a single container layer.
The galaxy_env role, galaxy files/galaxy app role can be separated into different layers to allow for more compact uploads of the container.

[innovate-invent]

We might want to switch to docker as the build engine rather than buildah. Ansible provides all the hooks we need to replace the buildah functionality. See https://docs.ansible.com/ansible/latest/scenario_guides/guide_docker.html

The idea is to run the base container, execute commands within the container instance, snapshot the container to an image and repeat for each layer. Ansible provides a plugin that allows dynamically adding the new containers to the ansible inventory to continue the operations on. The final snapshot gets tagged and pushed.

Edit: looks like this plugin is missing docker commit functionality to allow all of this to work.